名校
解题方法
1 . 在
中,
,
,M点为BC的中点,N点在线段AC上且
,
.
(1)求AC;
(2)若点P为AM与BN的交点,求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ba03505a2ec6653c4a65830d61694c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a07a68f3e85fe37916fb89f2f09ffa36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd1b3c262e8bf58c8479708d7496bbcd.png)
(1)求AC;
(2)若点P为AM与BN的交点,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45a8a837c11c07073da3ff751d70278.png)
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2023-06-21更新
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587次组卷
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2卷引用:湖北省随州市第一中学2023-2024学年高二上学期8月月考数学试题